[Bug]: JS Mode incorrectly flags static class properties as syntax error

### Describe the bug

In the JavaScript (JS) mode of Ace Editor, declaring static class properties (fields) causes a syntax highlighting and error detection issue. The editor incorrectly flags the static property declaration as a syntax error, even though it is valid JavaScript syntax (part of ECMAScript 2022 / ES13).

### Expected Behavior

The static class property declaration (static myStaticField = 'initial value';) should be recognized as valid syntax and should not be highlighted as an error.

### Current Behavior

The line containing the static class property declaration is highlighted with an error marker, indicating a syntax error.

### Reproduction Steps

1. Open Ace Editor.
2. Set the mode to `ace/mode/javascript`.
3. Enter the following code snippet:

```javascript
class Example {
static myStaticField = 'initial value'; // --> Warning: Class properties must be methods. Expected '(' but instead saw '='.

constructor() {
console.log(Example.myStaticField);
}
}

const instance = new Example();
```

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### Ace Version / Browser / OS / Keyboard layout

1.39.1 / any / any